Whoever values peace of mind and the health of the soul will live the best of all possible lives.

Aptitude found in the understanding and is often inherited. Genius coming from reason and imagination, rarely.

Persuade me or prove to me that I am mistaken in thought or deed, and I will gladly change - for it is the truth I seek, and the truth never harmed anyone. Harm comes from persisting in error and clinging to ignorance.

Suppose that men kill thee, cut thee in pieces, curse thee, what can these things do to prevent thy mind from remaining pure, wise, sober, just?

A rational nature admits of nothing but what is serviceable to the rest of mankind.

The things you think about determine the quality of your mind. Your soul takes on the color of your thoughts.

Happiness is no other than soundness and perfection of mind.